77 only one overcard on board against a semi short stack

[Stalrock]

Should I be going with this hand against this semi-short stack unknown, or is there no clear answer to this one? I would have to call about $50 to see a showdown after my flop bet.

Poker Stars, $1/$2 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

MP: $151.30
CO: $59.40
BTN: $101.15
Hero (SB): $235.10
BB: $111.20
UTG: $78

Pre-Flop: 7[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/heart.gif[/img] dealt to Hero (SB)
UTG calls $2, 3 folds, <font color="red">Hero raises to $10</font>, BB folds, UTG calls $8

Flop: ($22) 8[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $15</font>, <font color="red">UTG raises to $40</font>, Hero ???